May 23

May 23 - May 26

Boatnik 2025

SE-JET SPRI-OB RR-DRAG

Rogue River

Grants Pass, OR

May 24

May 24 - May 25

Red River Rumble F1 Powerboat Sh...

OPC

Red River

Shreveport, LA

May 24 - May 25

Newberg Memorial Weekend Boat Ra...

PRO-KPH-MOD-SO-OPC-J CLSES

Willamette River

Newberg Oregon, OR

May 24 - May 25

Spring Franklin

MOD-SO-J CLSES

Justus Lake

Franklin, PA

May 30

May 30 - Jun 1

Inboard Driving School

INB

Champions Lake Park

Springfield, Ohio, OH

May 31

May 31 - Jun 1

15th Annual Harry Brinkman Memor...

MOD;R-PRO-KPH-SO-J CLSES

Lake Clare

Huntington, IN

May 31 - Jun 1

Fireside 500

SO-J CLSES

Grand Lake

Presque Isle, MI

Jun 3

Jun 3 - Jun 7

Solar Splash: The Intercollegiat...

SE

Clark County Fairgrounds, Champions Park Lake

Springfield, OH

Jun 6

Jun 6 - Jun 8

Hydrofest on the Kennebec

MOD-SO-J CLSES

Kennebec River

Fairfield, ME

Jun 6 - Jun 8

Queen Marinette Regatta

PRO

Menominee River

Marinette, WI

Jun 6 - Jun 8

Guntersville Lake HydroFest

INB-OS-SO-OPC-UNL

Lake Guntersville

Guntersville, AL, AL

Jun 7

Jun 7 - Jun 8

Hardys Race For The Lake

VINTAGE-INB

Lake Decatur

Decatur, IL

Jun 7 - Jun 8

Lake Minden Regatta

PRO-KPH-MOD-SO-J CLSES

Lake Minden

Nicolaus, CA

Jun 7 - Jun 8

Piney Point Rumble on the River

VINTAGE

St. George\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'s Creek

Piney Point, MD

Jun 7 - Jun 8

Sonny Days

OB RR

Trinity River

Hoopa, CA

Jun 7 - Jun 8

4th Annual Howard Shaw Memorial ...

PRO-KPH-MOD-SO-J CLSES

Silver Lake

Everett, WA

mobile menu
expand
Modified Outboard Menu

Modified Outboard

Modified-Outboard

MOD racers aren't afraid to get their hands dirty - The goal in this category is to pull every last bit of horsepower out of your engine. In Modified Outboard, the engine builder's skill is just as important as the driver's. These boats are easily recognizable by their specially tuned pipes that make them as loud as they are fast. Because engines are constantly being modified to make the absolute most of what the rules allow, the competition is always fierce. Join the ranks of some of the best engine builders in the world, join Modified Outboard Racing.

Whether hydroplane or runabout, Modified classes are defined by the size of their engines (displacement). The numbers in the class names give you the approximate engine size in cubic centimeters. The 250ccMH, or 250 cubic centimeter Mod Hydro, is smaller than the 850ccMH, or 850 cubic centimeter Mod Hydro. Some classes have minimum weights, which increase with engine size. The smaller classes are often a good fit for younger, lighter drivers (14-year-olds may drive 200-250cc Mod classes, for example). The larger classes take considerable skill and experience. Propellers of four blades or less are used, and your prop choice can affect your speed enormously.

Modified Outboard Resources

Modified Outboard Classes